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Harmless recycling method for high-iron-chromium sludge

A harmless, high iron-chromium technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as secondary pollution of groundwater and soil, Effects of pollution, high hardness, and simple recycling method

Inactive Publication Date: 2014-11-12
JIANGXI GUANGDE ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above-mentioned defects and problems of the prior art, the purpose of the present invention is to provide a harmless recycling method for high-iron-chromium sludge, which solves the secondary pollution of groundwater and soil caused by the current landfill disposal method of this high-iron-chromium sludge technical issues

Method used

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  • Harmless recycling method for high-iron-chromium sludge
  • Harmless recycling method for high-iron-chromium sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The harmless recycling method of high-iron-chromium sludge is realized through the following steps:

[0025] Step 1. Put the high-iron-chromium sludge into the rotary kiln. The high-iron-chromium sludge passes through the drying section and the roasting section in the working area of ​​the rotary kiln in sequence. In the drying section, the drying temperature is controlled at 500°C, and the drying time is controlled at In the range of 50-90 minutes, after drying, it enters the roasting section and mixes with coal. The ratio of the weight of sludge after drying to the weight of coal is controlled to be 6-7:1, the roasting temperature is controlled to be 1000°C, and the roasting time is 50- Within 90 minutes, after cooling by the cooling water at the feeding port of the rotary kiln, the clinker is discharged; in the rotary kiln, the entire material process from entering the mill system to roasting the clinker in the rotary kiln is all in a closed cycle state , In the prod...

Embodiment 2

[0029] The harmless recycling method of high-iron-chromium sludge is realized through the following steps:

[0030] Step 1. Put the high-iron-chromium sludge into the rotary kiln. The high-iron-chromium sludge passes through the drying section and the roasting section in the working area of ​​the rotary kiln in sequence. In the drying section, the drying temperature is controlled at 500°C, and the drying time is controlled at In the range of 60 minutes, after drying, it enters the roasting section and mixes with coal. The ratio of the weight of sludge after drying to the weight of coal is controlled to be 6-7:1, the roasting temperature is controlled to be 1100°C, and the roasting time is within 60 minutes. Then, after the feeding port of the rotary kiln is cooled by cooling water, the clinker is obtained by cutting; in the rotary kiln, the entire material flow from entering the mill system to the roasting of the clinker in the rotary kiln is all in a closed cycle state, during...

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Abstract

The invention provides a harmless recycling method for high-iron-chromium sludge. The harmless recycling method comprises the following steps of sequentially drying and roasting the high-iron-chromium sludge in a sealed device, cooling the high-iron-chromium sludge to obtain clinkers, smashing and screening the clinkers and finishing recycling the high-iron-chromium sludge. Recycled derusting sand comprises the ingredient, by weight percentage, of 30%-35% of Cr2O3, 55%-60% of Fe2O3 and 1%-2% of NiO. The content of metallic oxide is high, the apparent density can be 3.3*103-3.9*103kg / m<3>, the mohs hardness can reach 7-8 levels, and the water content is smaller than or equal to 0.2%. Compared with existing derusting sand with quartz sand as the main ingredient, the recycled derusting sand with the metallic oxide as the main ingredient is high in hardness, more suitable for being used as derusting sand in producing machine manufacturing and ship building industry and better in derusting effect.

Description

technical field [0001] The invention relates to the technical field of recycling harmful sludge, in particular to a harmless recycling method for high-iron-chromium sludge. Background technique [0002] Stainless steel pickling is to make the surface of the steel clean. Before the steel is processed, use sulfuric acid or hydrochloric acid, nitric acid, hydrofluoric acid, or a mixture of the above-mentioned acids to pickle and derust the steel while heating. Steel component blanks are generally pickled before surface electroplating and spraying to remove oxides on the surface. Therefore, a large amount of waste acid water is produced in the production process of steel plants and stainless steel plants. A large amount of sludge is produced during the treatment of these acidic waters. Most of the metals contained in the sludge exist in the form of basic carbonates. This kind of sludge is hazardous waste and needs to be treated innocuously. At present, the disposal method of th...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/12B24C11/00
Inventor 甘力南
Owner JIANGXI GUANGDE ENVIRONMENTAL PROTECTION TECH CO LTD
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